公开(公告)号：US3849350A

公开(公告)日：1974-11-19

申请号：US36768073

申请日：1973-06-06

Applicant: ATOMIC ENERGY COMMISSION

Inventor： MATSKO J

IPC: C08J9/32 ,  C08G53/08 ,  C08J1/14

CPC classification number: C08J9/28 ,  C08J9/32 ,  C08J2201/0482 ,  C08J2363/00

Abstract: DRAWING

1. A PROCESS FOR PREPARING A LOW CONTENT AND LOW DENSITY SYNTACTIC FOAM PRODUCT COMPRISING MIXING AN EPOXY BINDER RESIN, A FLEXIBILIZER RESIN AND A CURING AGENT TO FORM A FIRST MIXTURE COMPRISING FROM ABOUT 5 TO ABOUT 10 WEIGHT PERCENT OF THE FINAL PRODUCT, AGITATING SAID FIRST MIXTURE, ADDING SUFFICIENT SOLVENT IN A PROPORTION OF FROMABOUT 200 MILLILITRES TO ABOUT 550 MILLILITRES SOLVENT PER 100 GRAMS OF SAID FINAL PRODUCT TO SIAD FIRST MIXTURE DURING SAID AGITATION TO PROVIDE A HIGHLY FLUID STATE SECOND MIXTURE, AND WHILE FURTHER AGITATING, ADDING HOLLOW MICROSPHERES TO SAID SECOND MIXTURE, POURING SAID SECOND MIXTURE SAID HOLLOW MICROSPHERES INTO A PRECOOLED RECEPTACLE TO DEPTH NOT GREATER THAN 1/2 INCH, THEREAFTER FREEZING SAID SECOND MIXTURE, SUBLIMING SAID SOLVENT FROM SAID SECOND MIXTURE WHILE MAINTAINING SAID FROZEN CONDITION, SAID SUBLIMATION YIELDING A DRY PRODUCT, CORPRESS ING SAID DRY PRODUCT AT FROM ABOUT 90 TO ABOUT 200 POUNDS PER SQUARE INCH AND CURING SAID COMPRESSED DEY PRODUCT YIELDING A SYNATACTIC FOAM PRODUCT HAVING A DENSITY OF FROM ABOUT 0.202 TO ABOUT 0.409 GRAMS PER CUBIC CENTIMETER AND A HOLLOW MICROSPHERE TO RESIN WEIGHT RATIO OF FROM ABOUT 90 T0 10 TO ABOUT 95 TO 5.